Abstract
A severe debris flow disaster occurred at the Atsumari river, Minamata city, in July2003. The origin of the debris flow is considered as a large scale landslide caused by heavy rainfall. The soil block produced by a landslide run out to the downstream area with liquification.I apply 2-D hybrid debris flow model to the debris flow disaster. It was proposed to explain the runoff process of the soil block including the fluidization phenomenon, which is composed of the usual two-dimensional debris flow model and a tracking model for soil block movement as solid.The model can reproduce the debris flow disaster. The rate of the fluidization strongly affects to the runoff process. The peak discharge becomes big due to the concentration of soil blocks at the front part of the debris flow. If the unsaturated part in the soil block becomes larger, the block can not continue to flow, and it forms a natural dam.
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